Notice that only half of the fix is available in gutsy 2.6.22 kernel.

Problem 1 is still open. The following UMTS PCMCIA card (and I believe
also the sister cards Onda H600  and ZTE MF330, plus probably many other
cards based on qualcomm chips) cannot be used if the kernel module
ehci_hcd is loaded.

ONDA CDMA Technologies MSM
Manufacturer: Qualcomm, Incorporated
Speed: 12Mb/s (full)
USB Version:  1.10
Device Class: 00(>ifc )
Device Subclass: 00
Device Protocol: 00
Maximum Default Endpoint Size: 64
Number of Configurations: 1
Vendor Id: 05c6
Product Id: 6613
Revision Number:  0.00

In other terms one has to chose to have either a high speed link to a
USB disk (with ehci_hcd) or to have a UMTS internet connection (with
sierra) but not both.

Please check if this has been fixed upstream and backport fix in case.
Otherwise please report the problem upstream. Please also consider
changing priority from "low" since this bug seriously hinders the
possibility of using a wireless UMTS internet connection.

For what concerns problem #2, this is in fact fixed in gutsy 2.6.22
kernel: once  ehci_hcd, the UMTS adapter gets correctly managed by the
sierra module.

-- 
USB subsystem confuses serial devices with ehci controller
https://bugs.launchpad.net/bugs/129433
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